CF MOTO CF500-5B 2009, Service Manual, Page: 267 / 272

13 Troubleshooting
13 - 19
13
Yes Clean or replace
2 Check idle speed valve whether clogged or not.
no next
Yes next
3
Check spark plug, look its type and gap if accords
with standard.
no Adjust or replace
Yes Clean
4
Check throttle valve body and idle speed side air
duct whether have carbide accumulated or not. no next
Yes Fault replacement
5
Disassembly injector, and check the injector by
special washing analysis instrument if exists the
phenomena of leaks, clogs or flux discrepantly.
no next
Yes Replace fuel
6
Check fuel and observe the fault if caused after
fueling
no next
yes
Eliminate engine
mechanism fault 7
Check air pressure of cylinder and observe the
pressure if is discrepantly.
no next
yes next
8
Check engine ignition timing if accords with
standard.
no
examine and repair
ignition timing
yes Diagnosis help
9
Contact EFI commutator, open ignition switch,
check ECU5#
#
10#
#
13# stitch, the power whether
supply normal or not, check 2#
#
21# stitch whether
Put up iron or not.
no
Examine and repair
relevant wiring
# #
7
$ $
Engine works regularly
% %
but unsteady idle speed when engine is in warming-up
Possible defective part
"
1
#
fuel containing water 2
#
engine water temperature sensor
%
3
#
spark plug
%
4
#
throttle valve body and idle speed side air duct; 5
#
input air duct
%
6
#
idle
speed valve
%
7
#
engine mechanism part
Overhaul:
"
Ref no Operation Test result Next Steps
yes
Examine and repair
air input system 1
Check air cleaner and input air duct whether are
clogged or not
no next
yes next
2
Check spark plug, look its type and gap if accords
with standard.
no Adjust or replace
yes Clean related parts
3
Disassembly idle speed valve and check the
throttle valve body, idle speed valve and idle
speed side air duct
whether have carbide
accumulated or not.
no next
yes
Examine and repair
wiring or replace
sensor
4
Pull out connector of engine water temperature
sensor, starting engine, observe idle speed
whether is unsteady or not when engine is in
warming-up.
no next
yes Fault replacement
5
Disassembly injector, and check the injector by
special washing analysis instrument if exists the
phenomena of leaks, clogs or flux discrepantly.
no next